Is there any way to...

change the sizes of many pictures at the same time using photoshop? i mean not doing compression, i mean changing it's pixels =P

tks in advance

Uhh . . . what are you trying to do?

Let me guess, you have abunch of pictures that you took with a digital camera . . .

try creating an action doing what it is you want to do; than use file/automate/batch to perform that action on any specified folder you have.

The action will take some work, making sure that it opens a each file (or Pict.), changes it, SAVES it, and closes it.